Power conversion circuit and electronic equipment

Abstract

A power conversion circuit and an electronic device belong to the technical field of power supplies and comprise a first DC converter, a second DC converter, a first switch and a second switch. The first switch, the output end of the first direct-current converter and the output end of the second direct-current converter are sequentially connected in series; the second switch is connected in parallel with the output end of the second DC converter; the first DC converter is used for outputting a first range voltage. The second DC converter is used for outputting a second range voltage; therefore, the adjusting range of the power switching circuit is widened.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular relates to a power supply conversion circuit and an electronic device. Background Art

[0002] For loads with a wider operating voltage range and higher power, the related power conversion circuit usually includes a DC converter and a control circuit. The control circuit receives the voltage information output by the powered device and outputs an adjustment signal based on the voltage information so that the DC conversion circuit outputs the supply voltage based on the adjustment signal.

[0003] However, the maximum output voltage of a single DC converter is limited and cannot meet the requirements of the powered equipment.

[0004] Therefore, the output range of the related power conversion circuit is relatively small. Summary of the invention

[0005] The purpose of the present application is to provide a power conversion circuit and an electronic device, aiming to solve the problem that the output range of the related power conversion circuit is small.

[0006] An embodiment of the present application provides a power conversion circuit, including a first DC converter, a second DC converter, a first switch, and a second switch;

[0007] The first switch, the output end of the first DC converter and the output end of the second DC converter are connected in series in sequence;

[0008] The second switch is connected in parallel with the output end of the second DC converter;

[0009] The first DC converter is used to output a first range voltage;

[0010] The second DC converter is used to output a second range voltage.

[0011] In one embodiment, the power conversion circuit has a first end and a second end, and the first end and the second end together constitute an output end of the power conversion circuit;

[0012] The first end of the first switch constitutes the first end of the power conversion circuit;

[0013] The second end of the first switch is connected to the positive output end of the first DC converter;

[0014] The negative output terminal of the first DC converter is connected to the positive output terminal of the second DC converter and the first terminal of the second switch;

[0015] The negative output terminal of the second DC converter and the second terminal of the second switch are connected and together constitute the second terminal of the power conversion circuit.

[0016] In one of the embodiments, the device is connected to a powered device, the powered device is used to output a connection detection signal, and to charge and / or operate according to the supplied direct current;

[0017] The power conversion circuit further includes:

[0018] a control circuit connected to the control end of the first switch, configured to receive the connection detection signal, and output a first switch signal in response to the connection detection signal being at a first level;

[0019] The first switch is used to transmit the power supply DC based on the first switch signal;

[0020] The voltage of the DC power supply is within the first range of voltages; or

[0021] The voltage of the supplied direct current is the sum of the first range voltage and the second range voltage.

[0022] In one of the embodiments, the powered device is further used to output voltage information; the voltage information includes a powered voltage, and the powered voltage is used to characterize a voltage of the powered device.

[0023] In one embodiment, it also includes:

[0024] a control circuit connected to the control end of the second switch, configured to receive the voltage information, and output a second switch signal in response to the receiving voltage being less than a preset voltage;

[0025] The second switch is used to bypass the second DC converter based on the second switch signal.

[0026] In one embodiment, the control circuit is further connected to the second DC converter, and is further used to disconnect the output of the enable signal in response to the receiving voltage being less than the preset voltage;

[0027] The second DC converter is further configured to stop outputting a second range voltage based on disconnection of the enable signal.

[0028] In one embodiment, it also includes:

[0029] a control circuit connected to the control end of the second switch, configured to receive the voltage information, and disconnect the output of the second switch signal in response to the receiving voltage being greater than or equal to a preset voltage;

[0030] The second switch is used to stop bypassing the second DC converter based on the disconnection of the second switch signal.

[0031] In one embodiment, the control circuit is further connected to the second DC converter, and is further configured to output an enable signal in response to the receiving voltage being greater than or equal to the preset voltage;

[0032] The second DC converter is specifically configured to output a second range voltage based on the enable signal.

[0033] In one embodiment, it also includes:

[0034] a control circuit, connected to the first DC converter, and configured to output a feedback signal according to the voltage of the DC power supply;

[0035] The first DC converter is further configured to adjust the first range voltage based on a feedback signal.

[0036] An embodiment of the present invention further provides an electronic device, wherein the electronic device includes the above-mentioned power conversion circuit.

[0037] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: since the output end of the first DC converter and the output end of the second DC converter can be connected in series and then supply power to the outside by turning on the first switch and turning off the second switch, the first DC converter can also be powered by the second switch bypassing the second DC converter by turning on the first switch and turning on the second switch; therefore, the output range of the power conversion circuit is broadened. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical invention in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of a power conversion circuit provided in one embodiment of the present application;

[0040] Figure 2 Another structural schematic diagram of a power conversion circuit provided in an embodiment of the present application;

[0041] Figure 3 Another structural schematic diagram of a power conversion circuit provided in an embodiment of the present application;

[0042] Figure 4 Another structural schematic diagram of a power conversion circuit provided in an embodiment of the present application;

[0043] Figure 5 Another structural schematic diagram of a power conversion circuit provided in an embodiment of the present application;

[0044] Figure 6 Another structural schematic diagram of a power conversion circuit provided in an embodiment of the present application;

[0045] Figure 7 Another structural schematic diagram of a power conversion circuit provided in an embodiment of the present application;

[0046] Figure 8 A partial exemplary circuit schematic diagram of a power conversion circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0049] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] Figure 1 The schematic diagram of the structure of the power conversion circuit provided by the preferred embodiment of the present application is shown. For the convenience of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0052] The power conversion circuit includes a first DC converter 01 , a second DC converter 02 , a first switch 03 and a second switch 04 .

[0053] The first switch 03 , the output end of the first DC converter 01 , and the output end of the second DC converter 02 are connected in series in sequence.

[0054] The second switch 04 is connected in parallel to the output terminal of the second DC converter 02 .

[0055] The first DC converter 01 is used for outputting a first range voltage.

[0056] The second DC converter 02 is used for outputting a voltage within a second range.

[0057] The range voltage can be a fixed value or a range value.

[0058] It should be noted that the first DC converter 01 and the second DC converter 02 may both include a switching power supply, an LLC resonant converter and a DC-DC output circuit based on PWM control.

[0059] It should be noted that the above power conversion circuit has three working modes:

[0060] In the first working mode, the first switch 03 is turned on and the second switch 04 is turned off. At this time, the output end of the first DC converter 01 and the output end of the second DC converter 02 are connected in series, and the first switch 03 outputs the power supply DC, the voltage of which is the sum of the first range voltage and the second range voltage.

[0061] In the second working mode, the first switch 03 is turned on, and the second switch 04 is turned on. At this time, the second switch 04 bypasses the second DC converter 02, and the first DC converter 01 outputs power supply DC through the first switch 03, and the voltage of the power supply DC is within the first range voltage.

[0062] In the third working mode, the first switch 03 is turned off, and the second switch 04 is turned on or off. At this time, the power conversion circuit stops outputting the power supply DC.

[0063] It can be understood that when the voltage of the powered device 90 is less than the preset voltage, the power conversion circuit can be operated in the second working mode; when the voltage of the powered device 90 is greater than or equal to the preset voltage, the power conversion circuit can be operated in the first working mode; thereby widening the output voltage range of the power conversion circuit.

[0064] Please continue to refer to Figure 1 The power conversion circuit has a first end and a second end, and the first end and the second end together constitute an output end of the power conversion circuit.

[0065] The first end of the first switch 03 constitutes a first end of the power conversion circuit.

[0066] The second end of the first switch 03 is connected to the positive output end of the first DC converter 01 .

[0067] The negative output terminal of the first DC converter 01 is connected to the positive output terminal of the second DC converter 02 and the first terminal of the second switch 04 .

[0068] The negative output terminal of the second DC converter 02 and the second terminal of the second switch 04 are connected and together constitute the second terminal of the power conversion circuit.

[0069] Through the above technical solution, the first switch 03, the output end of the first DC converter 01 and the output end of the second DC converter 02 are connected in series in sequence, and the second switch 04 and the output end of the second DC converter 02 are connected in parallel.

[0070] like Figure 2 As shown, the power conversion circuit is connected to the powered device 90, and the powered device 90 is used to output a connection detection signal and to charge and / or operate according to the supplied DC power;

[0071] The power conversion circuit further includes a control circuit 05 .

[0072] The control circuit 05 is connected to the control end of the first switch 03, and is used to receive a connection detection signal, and output a first switch signal in response to the connection detection signal being at a first level.

[0073] The first switch 03 is used to transmit the power supply DC based on the first switch signal.

[0074] The voltage of the DC power supply is within a first range of voltages; or

[0075] The voltage of the supplied direct current is the sum of the first range voltage and the second range voltage.

[0076] It can be understood that the first level may be a low level.

[0077] Through the above technical solution, when the connection detection signal is at the first level, the control circuit 05 outputs a first switching signal to enable the first switch 03 to transmit the power supply DC, so that the power conversion circuit can be started or stopped according to the connection status of the powered device 90, thereby improving the reliability and safety of the power conversion circuit.

[0078] In one embodiment, the powered device 90 is further used to output voltage information; the voltage information includes a powered voltage, and the powered voltage is used to represent the voltage of the powered device 90 .

[0079] Through the above technical solution, the power conversion circuit can output power DC according to the voltage of the powered device 90, reducing the possibility of overcharging and overvoltage, and improving the reliability and safety of the power conversion circuit.

[0080] like Figure 3 As shown, the above power conversion circuit also includes a control circuit 05.

[0081] The control circuit 05 is connected to the control end of the second switch 04 and is used to receive voltage information and output a second switch signal in response to the receiving voltage being less than a preset voltage.

[0082] The second switch 04 is used to bypass the second DC converter 02 based on the second switch signal.

[0083] Through the above technical solution, when the receiving voltage is less than the preset voltage, the control circuit 05 outputs a second switch signal to enable the second switch 04 to bypass the second DC converter 02, so that the power conversion circuit only outputs the first range voltage as the power supply DC power, so that the power conversion circuit can output a smaller voltage, reducing the lower limit of the output voltage of the power conversion circuit.

[0084] like Figure 4 As shown, the control circuit 05 is also connected to the second DC converter 02, and is also used to disconnect the output of the enable signal in response to the power receiving voltage being less than the preset voltage.

[0085] The second DC converter 02 is further configured to stop outputting the second range voltage based on disconnection of the enable signal.

[0086] Through the above technical solution, when the receiving voltage is less than the preset voltage, the control circuit 05 disconnects the output of the enable signal to stop the second DC converter 02 from outputting the second range voltage, thereby reducing energy consumption and increasing the service life of the power conversion circuit.

[0087] like Figure 5 As shown, the above power conversion circuit also includes a control circuit 05.

[0088] The control circuit 05 is connected to the control end of the second switch 04 and is used to receive voltage information and disconnect the output of the second switch signal in response to the receiving voltage being greater than or equal to a preset voltage.

[0089] The second switch 04 is used to stop bypassing the second DC converter 02 based on the disconnection of the second switch signal.

[0090] Through the above technical solution, when the receiving voltage is greater than or equal to the preset voltage, the control circuit 05 disconnects the output of the second switch signal to make the second switch 04 stop bypassing the second DC converter 02, so that the second range voltage and the first range voltage superimposed by the power conversion circuit are output as the power supply DC power, so that the power conversion circuit can output a larger voltage, thereby increasing the upper limit of the output voltage of the power conversion circuit; at the same time, the first switch 03 remains normally open during the switching process, thereby reducing the possibility of power failure of the output voltage of the power conversion circuit and improving the reliability of the system.

[0091] like Figure 6 As shown, the control circuit 05 is also connected to the second DC converter 02, and is also used to output an enable signal in response to the receiving voltage being greater than or equal to a preset voltage;

[0092] The second DC converter 02 is specifically configured to output a second range voltage based on the enable signal.

[0093] Through the above technical solution, when the receiving voltage is greater than or equal to the preset voltage, the control circuit 05 outputs an enable signal to enable the second DC converter 02 to output the second range voltage, thereby achieving the superposition output of the second range voltage and the first range voltage.

[0094] like Figure 7 As shown, the above power conversion circuit also includes a control circuit 05.

[0095] The control circuit 05 is connected to the first DC converter 01 and is used to output a feedback signal according to the voltage of the DC power supply. It can be understood that the feedback signal includes a voltage signal, a current signal and a PWM signal.

[0096] The first DC converter 01 is further configured to adjust the first range voltage based on the feedback signal.

[0097] It should be noted that when the powered device 90 is connected, the powered voltage is less than the preset voltage, the power conversion circuit operates in the second working mode, the voltage of the supplied DC power is in the first range voltage, and the control circuit 05 adjusts the first range voltage through the feedback signal so that the first range voltage is greater than or equal to the powered voltage, thereby achieving reliable power supply or charging of the powered device 90.

[0098] As the receiving voltage increases, the receiving voltage becomes greater than or equal to the preset voltage, the power conversion circuit operates in the first operating mode, the voltage of the supplied DC power is the sum of the first range voltage and the second range voltage, and the control circuit 05 adjusts the first range voltage through the feedback signal so that the sum of the first range voltage and the second range voltage is greater than or equal to the receiving voltage, thereby maintaining reliable power supply or charging for the powered device 90.

[0099] Through the above technical solution, the regulation accuracy of the power conversion circuit is improved, and the reliability and safety are further improved.

[0100] Figure 8 A partial exemplary circuit structure of a power conversion circuit provided by an embodiment of the present invention is shown. For the sake of convenience, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0101] The control circuit 05 includes a power delivery (PD) controller U1 and a first resistor R1.

[0102] The N-MOSFET control terminal USBP of the PD controller U1 constitutes the first switch signal output terminal of the control circuit 05, and is connected to the first switch 03 to output the first switch signal;

[0103] The output voltage terminal VO of the PD controller U1 is connected to the first end of the first resistor R1;

[0104] The second end of the first resistor R1 constitutes a DC power supply input end of the control circuit 05, and is connected to the first switch 03 and the first DC converter 01 to receive the DC power supply;

[0105] The current source output terminal of the PD controller U1 and the feedback signal output terminal of the OPTO control circuit 05 are connected to the first DC converter 01 to output a feedback signal;

[0106] The first general purpose input and output terminal GPIO3 of the PD controller U1 constitutes the second switch signal output terminal of the control circuit 05, and is connected to the second switch 04 to output the second switch signal;

[0107] The second general purpose input and output terminal GPIO2 of the PD controller U1 constitutes an enable signal output terminal of the control circuit 05 and is connected to the first DC converter 01 to output an enable signal;

[0108] The first configuration channel terminal CC1 of the PD controller U1 and the second configuration channel terminal CC2 of the PD controller U2 serve together as a voltage information input terminal of the control circuit 0501 and a connection detection signal input terminal of the control circuit 0501 to access voltage information and connection detection signals.

[0109] The control circuit 05 realizes the communication between the power conversion circuit and the powered device 90, and realizes the connection and disconnection control of the discharge circuit. The circuit is simple and reliable.

[0110] The first switch 03 includes a first field effect transistor M1 , a second resistor R2 and a third resistor R3 .

[0111] The drain of the first field effect transistor M1 constitutes the input end of the first switch 03, which is connected to the first DC converter 01 and the control circuit 05 to receive the DC power supply;

[0112] The source of the first field effect transistor M1 and the first end of the second resistor R2 are connected and together constitute the output end of the first switch 03 to output the power supply DC;

[0113] The gate of the first field effect transistor M1 is connected to the second end of the second resistor R2 and the first end of the third resistor R3;

[0114] The second end of the third resistor R3 constitutes a control end of the first switch 03 and is connected to the control circuit 05 to receive the first switch signal.

[0115] The circuit of the first switch 03 is simple and reliable.

[0116] The second switch 04 includes a second field effect transistor M2 and a fourth resistor R3.

[0117] The drain of the second field effect transistor M2 constitutes the input end of the second switch 04 and is connected to the positive input end of the second DC converter 02;

[0118] The source of the second field effect transistor M2 constitutes the output end of the second switch 04 and is connected to the negative input end of the second DC converter 02;

[0119] The gate of the second field effect transistor M2 is connected to the first end of the fourth resistor R4;

[0120] The second end of the fourth resistor R4 constitutes the control end of the first switch 03 and is connected to the control circuit 05 to receive the second switch signal.

[0121] The circuit of the second switch 04 is simple and reliable.

[0122] The following is a combination of working principles Figure 8 As shown for further explanation:

[0123] The powered device 90 is connected, and the powered device 90 outputs a connection detection signal. The first configuration channel terminal CC1 of the PD controller U1 and the second configuration channel terminal CC2 of the PD controller U2 receive the connection detection signal. In response to the connection detection signal being at the first level, the PD controller U1 outputs a first switch signal from the N-MOSFET control terminal USBP of the PD controller U1 to the gate of the first field effect transistor M1. The first field effect transistor M1 transmits the power supply DC based on the first switch signal. The powered device 90 also outputs voltage information; the voltage information includes the powered voltage; at this time, the powered voltage is less than the preset voltage, the first configuration channel terminal CC1 of the PD controller U1 and the second configuration channel terminal CC2 of the PD controller U2 receive the voltage information, and in response to the powered voltage being less than the preset voltage, the PD controller U1 outputs a second switch signal from the first general input and output terminal GPIO3 of the PD controller U1 to the gate of the second field effect transistor M2. The second field effect transistor M2 bypasses the second DC converter 02 based on the second switch signal. The PD controller U1 also disconnects the output of the enable signal in response to the receiving voltage being less than the preset voltage; the second DC converter 02 stops outputting the second range voltage based on the disconnection of the enable signal; the output voltage terminal VO of the PD controller U1 receives the voltage of the power supply DC power, and the PD controller U1 outputs a feedback signal from the current source output terminal OPTO of the PD controller U1 to the first DC conversion circuit based on the voltage output of the power supply DC power, and the first DC converter 01 adjusts the first range voltage based on the feedback signal, and the first range voltage is greater than or equal to the receiving voltage. Since the voltage of the power supply DC power is the first range voltage at this time, the voltage of the power supply DC power is greater than or equal to the receiving voltage.

[0124] As the powered device 90 is charged according to the supplied DC power, the powered voltage increases, and the powered voltage is greater than or equal to the preset voltage. The powered voltage of the PD controller U1 is greater than or equal to the preset voltage, and the second switching signal is stopped from being output from the first general input and output terminal GPIO3 of the PD controller U1 to the gate of the second field effect transistor M2. The second field effect transistor M2 stops bypassing the second DC converter 02 based on the disconnection of the second switching signal. The PD controller U1 also outputs an enable signal from the second general input and output terminal GPIO1 of the PD controller U1 in response to the receiving voltage being greater than the preset voltage; the second DC converter 02 outputs a second range voltage based on the enable signal; at this time, the output terminal of the first DC conversion circuit and the output terminal of the second DC conversion circuit are connected in series, and the voltage of the power supply DC is the sum of the second range voltage and the first range voltage; at the same time, the output voltage terminal VO of the PD controller U1 receives the voltage of the power supply DC, and the PD controller U1 outputs a feedback signal from the current source output terminal OPTO of the PD controller U1 to the first DC conversion circuit according to the voltage output of the power supply DC, and the first DC converter 01 adjusts the first range voltage based on the feedback signal so that the sum of the first range voltage and the second range voltage is greater than the receiving voltage. Since the voltage of the power supply DC is the sum of the first range voltage and the second range voltage at this time, the voltage of the power supply DC is greater than the receiving voltage.

[0125] In one embodiment, taking the output voltage of the first DC converter as 5V-28V and the output voltage of the second DC converter as 20V as an example, when the system request voltage (power receiving voltage) exceeds the maximum output voltage of the first DC converter of 28V, the second DC converter is started, and as the voltage of the second DC converter rises from 0V to the set value (20V), the output voltage of the first DC converter will also rise, and the output voltage of the first DC converter is dynamically adjusted by real-time detection of the supply DC.

[0126] If the system requires an output voltage (voltage required by the powered device) of 5V-28V, the first DC converter adjusts the output voltage to the voltage required by the powered device based on the feedback signal, and the second DC converter is turned off.

[0127] If the system requires an output voltage of 29V, the first DC converter is dynamically adjusted to 9V and the second DC converter to 20V.

[0128] The system requires an output voltage of 36V, the first DC converter dynamically adjusts to 16V, and the second DC converter to 20V.

[0129] The system requires an output voltage of 48V, the first DC converter is dynamically adjusted to 28V, and the second DC converter is 20V.

[0130] The second DC converter can be set to a fixed voltage, a multi-level voltage or a certain voltage range. Setting the voltage range can make the output power of the first DC converter and the second DC converter as close as possible.

[0131] In this embodiment, the first DC converter is set to a variable voltage, and the second DC converter is set to a fixed voltage. The output voltage of the second DC converter can be increased from 0V to a set value of 20V, that is, the output voltage of the first DC converter is dynamically adjusted through the feedback signal according to the system requirements (power receiving voltage), and the first switch 03 is kept normally open during the switching process of the second switch 04, reducing the possibility of power failure of the output voltage of the power conversion circuit.

[0132] Thus, reliable power supply or charging of the power receiving device 90 is achieved.

[0133] An embodiment of the present invention further provides an electronic device, which includes the above-mentioned power conversion circuit.

[0134] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0135] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A power conversion circuit, characterized in that: comprising a first DC converter, a second DC converter, a first switch and a second switch; The first switch, the output end of the first DC converter and the output end of the second DC converter are connected in series in sequence; The second switch is connected in parallel with the output end of the second DC converter; The first DC converter is used to output a first range voltage; The second DC converter is used to output a second range voltage.

2. The power conversion circuit according to claim 1, characterized in that: The power conversion circuit has a first end and a second end, and the first end and the second end together constitute an output end of the power conversion circuit; The first end of the first switch constitutes the first end of the power conversion circuit; The second end of the first switch is connected to the positive output end of the first DC converter; The negative output terminal of the first DC converter is connected to the positive output terminal of the second DC converter and the first terminal of the second switch; The negative output terminal of the second DC converter and the second terminal of the second switch are connected and together constitute the second terminal of the power conversion circuit.

3. The power conversion circuit according to claim 1, characterized in that: Connecting to a powered device, the powered device is used to output a connection detection signal and to charge and / or operate according to the supplied direct current; The power conversion circuit further includes: a control circuit connected to the control end of the first switch, configured to receive the connection detection signal, and output a first switch signal in response to the connection detection signal being at a first level; The first switch is used to transmit the power supply DC based on the first switch signal; The voltage of the DC power supply is within the first range of voltages; or The voltage of the supplied direct current is the sum of the first range voltage and the second range voltage.

4. The power conversion circuit according to claim 3, characterized in that: The powered device is further used to output voltage information; the voltage information includes a powered voltage, and the powered voltage is used to characterize the voltage of the powered device.

5. The power conversion circuit according to claim 4, characterized in that: Also includes: a control circuit connected to the control end of the second switch, configured to receive the voltage information, and output a second switch signal in response to the receiving voltage being less than a preset voltage; The second switch is used to bypass the second DC converter based on the second switch signal.

6. The power conversion circuit according to claim 5, characterized in that: The control circuit is also connected to the second DC converter, and is further used to disconnect the output of the enable signal in response to the receiving voltage being less than the preset voltage; The second DC converter is further configured to stop outputting a second range voltage based on disconnection of the enable signal.

7. The power conversion circuit according to claim 4, characterized in that: Also includes: a control circuit connected to the control end of the second switch, configured to receive the voltage information, and disconnect the output of the second switch signal in response to the receiving voltage being greater than or equal to a preset voltage; The second switch is used to stop bypassing the second DC converter based on the disconnection of the second switch signal.

8. The power conversion circuit according to claim 7, characterized in that: The control circuit is also connected to the second DC converter, and is further used to output an enable signal in response to the receiving voltage being greater than or equal to the preset voltage; The second DC converter is specifically configured to output a second range voltage based on the enable signal.

9. The power conversion circuit according to claim 3, characterized in that: Also includes: a control circuit, connected to the first DC converter, and configured to output a feedback signal according to the voltage of the DC power supply; The first DC converter is further configured to adjust the first range voltage based on a feedback signal.

10. An electronic device, characterized in that: The electronic device comprises the power conversion circuit as claimed in any one of claims 1 to 9.

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